FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.2.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

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Extension: Target invariant

Official URL: http://hl7.org/fhir/StructureDefinition/cqf-targetInvariant				Version: 5.2.0-ballot
Standards status: Deprecated		Maturity Level: 2	Responsible: HL7 International / Clinical Decision Support	Computable Name: TargetInvariant
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1694

DEPRECATED: Use the targetConstraint extension instead. Specifies an invariant that is enforced on instantiated resources. This extension can be applied to any element of a definitional resource (such as ActivityDefinition or Measure) and indicates that the invariant should be enforced on resources that are instantiated from the definition. For example, this extension can be used to define a constraint such as numerator count must be less than or equal to denominator count.

This extension allows invariants to be specified as part of definitional resources as an alternative to having to define a profile to enforce the constraint.

Context of Use

This extension may be used on the following element(s):

• Element ID: ActivityDefinition
• Element ID: ActivityDefinition.code
• Element ID: ActivityDefinition.intent
• Element ID: ActivityDefinition.priority
• Element ID: ActivityDefinition.doNotPerform
• Element ID: ActivityDefinition.timing[x]
• Element ID: ActivityDefinition.asNeeded[x]
• Element ID: ActivityDefinition.location
• Element ID: ActivityDefinition.participant
• Element ID: ActivityDefinition.product[x]
• Element ID: ActivityDefinition.quantity
• Element ID: ActivityDefinition.dosage
• Element ID: ActivityDefinition.bodySite
• Element ID: ActivityDefinition.dynamicValue
• Element ID: Measure
• Element ID: Measure.group
• Element ID: Measure.group.population
• Element ID: Measure.group.stratifier
• Element ID: Measure.supplementalData
• Element ID: PlanDefinition
• Element ID: PlanDefinition.goal
• Element ID: PlanDefinition.goal.target
• Element ID: PlanDefinition.actor
• Element ID: PlanDefinition.action
• Element ID: Questionnaire
• Element ID: Questionnaire.item

Usage info

Usage:

• This Extension is not used by any profiles in this Implementation Guide

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

 

Other representations of profile: CSV, Excel, Schematron

Terminology Bindings

Path	Conformance	ValueSet	URI
Extension.extension:severity.value[x]	required	ConstraintSeverity http://hl7.org/fhir/ValueSet/constraint-severity from the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

R4B

The extension is unchanged in R4B

R4

The extension is unchanged in R4

R3

The extension is represented a little differently in R3:

• Replace the type Expression with a set of extensions for the content of the type along with the _datatype extension
• Note: Extensions that have been modified for R3 are still draft while real-world experience is collected

Name	Flags	Card.	Type	Description & Constraints
Extension		0..*	Extension	A constraint on the target resource
Slices for extension				Content/Rules for all slices
extension:key		1..1	Extension	Unique identifier
extension		0 .. 0
url		1 .. 1	uri	"key"
value[x]		1.. 1	id	Value of extension
extension:requirements		0..1	Extension	Why the invariant is defined
extension		0 .. 0
url		1 .. 1	uri	"requirements"
value[x]		1.. 1	string	Value of extension
extension:severity		1..1	Extension	error | warning
extension		0 .. 0
url		1 .. 1	uri	"severity"
value[x]		1.. 1	code	Value of extension Binding: ConstraintSeverity ( required )
extension:expression		1..1	Extension	The invariant expression
Slices for extension		0 ..*	Extension	Extension Slice: Unordered, Open by value:url
extension:_datatype		1..1	(Complex)	DataType name 'Expression' from R5 URL: http://hl7.org/fhir/StructureDefinition/_datatype
value[x]		1.. 1	string	Value of extension Fixed Value: Expression
extension:description		0..1	Extension	Natural language description of the condition
extension		0 .. 0
url		1 .. 1	uri	"description"
value[x]		1.. 1	string	Value of extension
extension:name		0..1	Extension	Short name assigned to expression for reuse
extension		0 .. 0
url		1 .. 1	uri	"name"
value[x]		1.. 1	code	Value of extension
extension:language		0..1	Extension	text/cql | text/fhirpath | application/x-fhir-query | etc.
extension		0 .. 0
url		1 .. 1	uri	"language"
value[x]		1.. 1	code	Value of extension Binding: ExpressionLanguage ( extensible ): The media type of the expression language. Additional Bindings Purpose MimeTypes Max Binding
extension:expression		0..1	Extension	Expression in specified language
extension		0 .. 0
url		1 .. 1	uri	"expression"
value[x]		1.. 1	string	Value of extension
extension:reference		0..1	Extension	Where the expression is found
extension		0 .. 0
url		1 .. 1	uri	"reference"
value[x]		1.. 1	uri	Value of extension
url		1 .. 1	uri	"expression"
value[x]		0 .. 0
url		1 .. 1	uri	"http://hl7.org/fhir/StructureDefinition/cqf-targetInvariant"
value[x]		0 .. 0
Documentation for this format

Search Parameters for this Extension

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